Carbureter.



W. H. SCHULTE.

CARBURETER.

APPLICATION FILED APR. 14. |915.

WILLIAM lH. SCHULTE, OF TRENTON, NEW JERSEY.

CAR-BURETER.

Specification of Letters Patent.

Patented Nov.. 9, 1915,

Application ledl April 14g, 1915. Serial No. 21,207.

To all whom t may concern.'

Be it known that I, VLLLIAM H. SGHULTE,

a citizen of the United States, residing at Trenton, county of Mercer, and State of New Jersey, have invented certain new and useful Improvements in Carbureters, fullyl described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to carbureters for internal combustion engines, the object of the invention being to provide a simple and efficient carbureter in which the fuel feed and air supply shallbe controlled by the suction so as to assure the proper mixture at different speeds, and the supplemental air supply be increased and decreased in the proper manner 'so as to secure smooth and uniform running of the engine on all changes of speed.

A further object is to provide such a car-- bureter of cheap and convenient construction such as to be readily manufactured in large quantities and assembled readily for different installation connections, and with the parts readily accessible and removable for renewal or repair.

For a full understanding of the invention, a detailed description of a construction embodying all the features of the Same in their preferred Aform will now be given in connection with the accompanying drawings forming a part of this specification, and the features forming the invention then specifically pointed out in the claims.

In the drawings c--Figure 1 is a vertical central section of the carbureter. Fig. 2 is a plan view of the same, partly brokenaway to show the starting air valve, and Fig. 3 is a plane lay out of the Supplemental air valve flange.

ln the drawings, A is a casting forming part ofthe miXing chamber and the outlet passage controlled by the usual disk throttle valve 10, and having the usual fia-nge for connection to the engine.

- B is the fuel reservoir having the usual inlet valve 11 controlled by float 12, and having the fuel feed -passage 13, this chamber B being secured to the bottom of casting reservoir bowl and simply held together by the bolt 14, and it is thus possible to turn the cap 15 wlth the fuel supply connections to any point desired for convenience 1n connecting up the reservoir. -The entire valve construction, also, is thus separate from and independent of the bowl, whichis convenlent for manufacture, testing and assembling. A portion of the mixing chamber and the supplemental air inlet chamber is formed by casting C preferably secured to casting A by vbolt screw 16 passing through the mixing chamber and vinto spider orcross-bar 1,7, which seats against shoulder 1 on casting C to hold castings A, C together. For the purpose of adapting the carbureter for engine connectionl'either with the casting A vertical, as shown, or turned in either direction 90O for a horizontal connection, the mixing chamber portion of the casting A is preferably made rectangular, as shown, and is provided with openings 8 in theibottom and each of its side walls for the screw bolt 14, so that the fuel reservoir B may be secured to the casting A in either of the three positions, the two openings 8, which arel not in use, being closed by Screw caps.

rfhe casting-C is provided with' a downward cylindrical extension 18, forming the primary air passage and inclosing nozzle 19` 'which is vscrewed into casing B for connection of the nozzle passage with fuel supply passage 13.. The'nozzle 19 has a fuel opening 2 above'the fuel level, and positioned so as to. supply `fuel for starting and low speeds with their low suction, and an opening 3 at the top of the nozzle through which additional fuel is drawn on higher speeds and greater suction. As shown, a connection 20, for hot air supply, closes the lower end of the air passage 18, but it will be understood that this is not necessary where hot air is not to be supplied, and that the air passage 18 may open directly to the atmosphere about the nozzle 19.

The casting C forming the supplemental air chamber, is provided with a circular opening in its top wall on which is secured 'a capthe lower rim 21 of which forms a valve seat for supplemental air valve 22 normally closed by coil spring 23 compressed between the valve and an abutment 24. secured on stem 25 upon which the valve slides freely and which' extends upward through the top 26 of the cap andl is screwthreaded therein for adjustment of the tension of spring 23, and locked in position by lock-nut 27 clamping split hub 28 upon the stem. The -valve 22 is provided with an upwardly-ext'ending peripheral flange l having an inclined or curved cut off edge 5, this edge being shown as a helical or small pitch extending throughout the periphery of the valve, so that, as the valve 22 opens, the lowest part of this cut off edge first passes the port and then the port is gradually opened by lthe flange in accordanceA with the suction and the pressure of spring 23`to secure a very gradual change of air supply in accordance with changes of speed. The cap is provided with side walls 6 forming ports for the passage of air to the valve 22, and a rotary cover or air shut oif valve 29 is mounted to rotate on the cap-and proy with the cutoff edge 5, secures a very smooth action of the engine on changes of speed, as this edge may readily be formed to 'secure just the required action of the supplemental'y valve in connection with itsl pressure spring, the changes 'of air admission being thus made very gradual and in correct proportion throughout the entire Valve movement. It is important to use a supplemental air valve of large area for control by slight changes in suction, but such large valves give too much increase of valve area on opening. The flange corrects this, so that a large valve may be used with any rate of change of air inlet area desired. The long stroke of the valve made possible by this flange, is important, also, in that it avoids the use of all dash pot or check devices to retard the valve movement, as the valve remains substantially stationary between strokes of the engine cylinders, in accordance with its adjustment and the vacuum resulting yfrom the engines speed, it being possible to'use a light spring so that the pressure tending to close the valveis not so great as in other large supplemental valve constructions. It will be understood that, while the -lange with its cutoff edg'e has been shown as on the valve itself, the same result maybe secured by forming the valve seat with a ange having such an edge passed by the valve in opening and closing.,

It will be seen also that the carbureter is very simple and cheap of manufacture, and that the arrangement of the fuel nozzle, with the mainand supplemental air inlets, produces a most eflicient and economical'carbureter. The parts, also, are most convenient of access and removal for renewal or repair.'

tering the top of casting C, and by removing these screws the whole supplemental valve construction may readily be removed for inspection and repair.

What is claimed is:

l. A carbureter having a supplemental air valve spring pressed and controlled by the carbureter pressure, and a port-closing flange provided with an inclined or helical edge determining the rateof opening of the air inlet'port during the movement of the valve. r

. 2. In a carbureter, the combination with a fuel nozzle having outlets at different levels, of a primary air'inlet the air from which passesI the lower outlet of the nozzle, a supplemental air inlet supplying air at or near the level of the upper outlet of the nozzle, a supplemental airvalve spring pressed and controlled by the carbureter pressure, and a port-closing flange provided with an inclined or helical edge determining the rate of opening of the air inlet port during the movement of the valve.

In a carbureter, the combination with a fuel nozzle having outlets at different levels, of a primary air inletthe air from which passes the lower outlet of the nozzle, a supplemental air inlet supplying vair at or near the level of the upper outlet of the nozzle, a supplemental air valve spring pressed and controlled by the carbureter pressure, a port closing-flange provided with an inclined or helical edge determining the rate ,of opening of the air inlet port during the movement of the valve, and a manually controlled 5. In a carbureter, the combination of cas- 130A Avalve for closing the supplemental air inlet. I 4. In a carbureter, the combination 'with Llamas ing member A by which the carbureter is `secured to the engine, of fuel reservoir B having adjustable cover 15 carrying the fuel supply connection and fuel valve and secured to'member .A by central bolt 14, said member A being provided With openings in a plurality of sides for bolt 14, whereby member A may be turned for vertical or horizontal connection to the engine, andthe 'ing Witnesses.

reservoir secured thereto', substantially as la described.

In testimony whereof, I have hereunto set my hand, in the presence of two. subscrib- 

